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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 176
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E. R. JOHNSON. TALKING MACHINE. APPLICATION FILED DEC. 13, 1912. 1,235,695. Patented Aug. 7,1917. 3 SHEETS-SHEET I. -Fk&. J. … WITNESSESPhonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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